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ANGULAR MOMENTUM Unit 16 Dr. John P. Cise, Professor =
of
Physics, Austin Community Com. College, 1212 Rio Grande St., Austin Tx
78701 jpcise@austincc.edu & New York Times November 30, 2008 by Seth Mydans
U.S. Deportee Brings Street Dance to
Street Boys of Cambodia
PHNOM
PENH, Cambodia
— It may be the only place in Cambodia where the children are nicknam=
ed
Homey, Frog, Floater, Fresh, Bugs and Diamond. Skip to next paragraph
=
=
BEFORE(arms out);AFTER(in)=
=
&nb=
sp; =
&nb=
sp; =
&nb=
sp; =
Tach Piseth, 11, pract=
iced
spinning on his head at the Tiny Toones break dancing club in Phnom Penh,
Cambodia. The club teaches about 150 youngsters.
------------------------------------------------=
---------------------------------------------------------------------------=
----------------------------
Introducti=
on: This
break dancer had a initial moment of inertia I1 =3D 100 kg m2
and an angular frequency of 2 rev/s.
Remember t=
hat with
NO EXTERNAL torque the angular momentum is conserved.
Question: =
(a)
After bringing his arms close to his body{reducing his moment of inertia to I2 =3D 75 kg m2=
}
find his
new angular
frequency? (b) Find his initial angular kinetic energy and final kinetic
energy? Note: angular velocit=
y =3D 2
(pi) X frequency ,
Angular ki=
netic
energy =3D ½ I (angular velocity)2 . (c) Where did the
additional kinetic energy come from? (c) Compute the amount of <=
/b>
work this =
break
dancer did to achieve this higher angular kinetic energy?
ANSWERS:(a=
) 2.67
rev/s (b) 7895.7 J , 10,554 J (c)
________________(d) 2658 J
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